Bennelongia ivanae, Martens & Halse & Schön, 2013

Martens, Koen, Halse, Stuart & Schön, Isa, 2013, On the Bennelongia barangaroo lineage (Crustacea, Ostracoda) in Western Australia, with the description of seven new species, European Journal of Taxonomy 66, pp. 1-59 : 33-35

Bennelongia ivanae sp. nov.

Fig. 15

urn:lsid:zoobank.org:act:2D60FC82-0938-475A-AF4E-E2DBE24D1D8D

Diagnosis

Valves ( Fig. 15 A-B) high and rounded, with greatest height situated well in front of the middle; dorsal margin with blunt angle towards the posterior side; ventral margin almost straight, without pronounced mandibular curve. LV ( Fig. 15A ) with antero-ventral il well-developed in lower third of the valve, dorsal il descending almost to ventral side, thus clearly overlapping with ventral il. RV ( Fig. 15B ) without antero-ventral lapel ( Fig. 15 H-J). Carapace in dorsal and ventral views ( Fig. 15 D-F) with greatest width in the middle, medium hirsute and slightly pitted, anteriorly with a hint of a rostrum; in lateral view ( Fig. 15C, G ) anteriorly with a clear LV>RV overlap.

Male unknown.

Etymology

This species is named after Dr Ivana Karanovic ( South Korea), in recognition of her contributions to the knowledge of the subterranean candonids of the Pilbara area.

Measurements (all measurements in µm – see Table 1 for measurements of all specimens illustrated with SEM)

Holotype ♀ ( WAMC52280 ): RV: L = 1475, H = 915. LV: L = 1533, H = 948.

Type locality

Rock pools (gnammas) on Holland Rocks, WA. Approximate coordinates: 33°21’35.66’’ S, 118°44’48.55” E (WGS 84) (sample DJC/02). All specimens collected and handpicked by D.J. Cale on 30 Aug. 2011.

Type material

Holotype

♀ valves stored dry ( WAMC52280 ).

Allotype

As males are unknown, no allotype is designated.

Paratypes

Four ♀♀ with valves or carapaces stored dry ( WAMC 52281-52282; OC.3326-3327); ca. 25 ♀♀ stored dry as bulk in one micropalaeontological slide.

Other material investigated

? ♀♀ valves stored dry ( WAMC 52284) from Yanneymooning Rocks ( OSTR 013F).

Differential diagnosis

Bennelongia ivanae sp. nov. differs from all other WA species within the B. barangaroo lineage in the total absence of an antero-ventral lapel on the RV and in the fact that the antero-dorsal il in the LV runs almost entirely to the ventral margin. Bennelongia mckenziei Shearn et al., 2012 from Queensland also lacks the antero-ventral lapel on the RV completely, but it has a notably different valve and carapace shape, with a more pointed caudal margin and an evenly sloping dorsal margin in both valves, a shorter antero-dorsal il in the LV and an anterior LV>RV overlap in a carapace in right lateral view which is twice as large as in B. ivanae sp. nov.

Remark

Bennelongia ivanae sp. nov. and B. mckenziei have pronounced molecular differences, when the present sequences of B. ivanae sp. nov. are compared with those of Shearn et al. (2012). Because of the shorter lengths of the sequences provided by Shearn et al. (2012), the alignment of COI sequences from B. ivanae sp. nov. and B. mckenziei are not shown in the present paper.

Ecology and distribution

The species has thus far been found with certainty only from rockpools at Holland Rocks. Two tentatively identified females also originated from rock pools on another outcrop.

Figures

Fig. 15. Bennelongia ivanae sp. nov., type specimens from type locality (Holland Rocks, DJC/02). A. ♀ holotype, LVi (WAMC52280). B. ♀ holotype, RVi (idem). C. ♀ paratype, CpRL (OC.3327). D. ♀ paratype CpD (WAMC52281). E. ♀ paratype, CpV (WAMC52282). F. ♀ paratype, CpV, detail anterior (idem). G. ♀ paratype, CpRL, detail anterior (OC.3327). H. ♀ holotype, RVi, detail anterior (WAMC52280). I. ♀ holotype, RVi, detail anterior, tilted (idem). J. ♀ paratype, RVi, detail anterior, tilted (OC.3326). Scales: A-E = 1 mm; F = 400 µm; G-J = 200 µm.